affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, University of New South Wales (UNSW) - Electron Microscopy Unit, University of Science and Technology of China (USTC) - National Synchrotron Radiation Laboratory Research Center, University of Science and Technology of China (USTC) - National Synchrotron Radiation Laboratory Research Center, affiliation not provided to SSRN, Australian National University (ANU) - School of Computing, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN, affiliation not provided to SSRN and University of New South Wales